problem sending email from zimbra 8.0.3

May 21 14:19:09 webmail postfix/smtpd[16911]: warning: connect to private/policy: No such file or directory
May 21 14:19:10 webmail postfix/smtpd[16911]: warning: connect to private/policy: No such file or directory
May 21 14:19:10 webmail postfix/smtpd[16911]: warning: problem talking to server private/policy: No such file or directory